A compendium of astronomy; containing the elements of the science, familiarly explained and illustrated, with the latest discoveries. Adapted to the use of schools and academies, and of the general reader (1850)
Olmsted, Denison, 1791-1859 · New York, R. B. Collins · leaf 86
ld/be seen on the solar disk, would [be less than that occupied inthe remainder of the revolution;.Thus, let S, (Fig. 18,) be thesun, E the earth, and abc the pathof the body, revolving aboutthe sun. Unless the spot werenearly or quite in contact withthe body of the sun, being pro-jected upon his… … 106. How are the spots known to be nearly or quite in con-tact with the body of the sun? Illustrate by figure 18. Whatcauses the motion of the spots ? What is the period of the sunsrevolution on his axis ? Explain by figure 19. 7 74 THE SUN. the lines which all the solar spots describe on the…
Astronomy
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